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MC68HC705P9CS Datasheet(PDF) 131 Page - Freescale Semiconductor, Inc

Part # MC68HC705P9CS
Description  Microcontrollers
PDF  160 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC68HC705P9CS Datasheet(HTML) 131 Page - Freescale Semiconductor, Inc

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Analog-to-Digital Converter (ADC)
Operation
MC68HC705P9 — Rev. 4.0
Technical Data
MOTOROLA
Analog-to-Digital Converter (ADC)
131
11.4 Operation
The A/D conversion process is ratiometric, using two reference voltages,
V
RH and VSS. Conversion accuracy is guaranteed only if VRH is equal to
V
DD.
11.4.1 Pin Functions
The ADC uses five pins and shares them with port C:
•
PC7/VRH
•
PC6/AN0, PC5/AN1, PC4/AN2, and PC3/AN3
11.4.1.1 PC7/VRH
The voltage reference high pin (PC7/VRH) supplies the high reference
voltage for the ratiometric conversion process. For ratiometric
conversion, the supply voltage of the analog source should be the same
as V
RH and be referenced to VSS.
Addr.
Name
Bit 76
5
4
3
2
1Bit 0
$001D
ADC Data Register
(ADDR)
See page 136.
Read:
Bit 7
6
5
4
3
2
1
Bit 0
Write:
Reset:
Unaffected by reset
$001E
ADC Status/Control Register
(ADSCR)
See page 134.
Read:
CCF
ADRC
ADON
00
CH2
CH1
CH0
Write:
Reset:
0
00
000
00
= Unimplemented
Figure 11-2. ADC I/O Register Summary
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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